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Resource allocation method of sharing OFDMA system between high speed train and local user

A technology for local users and high-speed trains, applied in the distribution between users/terminals, transmission systems, digital transmission systems, etc., and can solve the problems of inter-carrier interference, system resources cannot be better and effectively allocated, etc.

Inactive Publication Date: 2015-04-08
TSINGHUA UNIV
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  • Claims
  • Application Information

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Problems solved by technology

When the user is in a high-speed mobile state, the channel fading characteristics will be quite different from those in the low-speed mobile state, and OFDM will also have the problem of inter-carrier interference. It can be seen that high-speed mobile users and low-speed mobile users have different channel state characteristics, while traditional OFDMA The network resource allocation method does not consider these two types of users separately, so that system resources cannot be better and effectively allocated

Method used

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  • Resource allocation method of sharing OFDMA system between high speed train and local user
  • Resource allocation method of sharing OFDMA system between high speed train and local user
  • Resource allocation method of sharing OFDMA system between high speed train and local user

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Embodiment Construction

[0017] The present invention will be further described below in conjunction with the accompanying drawings.

[0018] The high-speed train referred to in the present invention refers to trains with an hourly speed of more than 150 km / h such as bullet trains and high-speed rails.

[0019] 1. figure 1 The network model adopted by the present invention is shown. The coverage radius of the base station is R, and the vertical distance between the train track and the base station is d v , there are M local users in the system, denoted by m=1,2,...,M, and it is assumed that all local users are quasi-stationary. Assuming that the train is moving at a constant speed, its moving speed is v, and the moving relay on the train is represented by m=0. by figure 1 Middle O point is the zero point in time, so the present invention takes the train passing through the base station BS1 as an example, discussing in The resource allocation problem of local users and mobile relays on trains, wh...

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Abstract

The invention discloses a resource allocation method of sharing OFDMA system between high speed train and local user, the main purpose thereof is to provide a resource allocation method of sharing OFDMA system between high speed train and local user that maximizes the transmission rate of mobile relay on the premise of guaranteeing the requirements of the transmission rate of the local user. The method defines the optimal power distribution factor and the optimal subcarrier distribution factor in the ith dispatching cycle respectively as Eta (i) and Beta (i), and defines the transmission rate of the mobile relay as G1 (Eta (i), Beta (i)), the total transmission rate of the local user as G2 (Eta (i), Beta (i)), and the total transmission rate of the local user when a base station allocates all resources to the local user as a calculation formula of Csum; Beta (i) and Eta (i) are figured out based on that G2 (Eta (i), Beta (i)) = Rho Csum and G1 (Eta (i), Beta (i)) is closest to a peak value. The satisfaction of G2 (Eta (i), Beta (i)) = Rho Csum is for guaranteeing the requirements of the transmission rate of the local user; and making G1 (Eta (i), Beta (i)) be closest to the peak value is for maximizing the transmission rate of the mobile relay, because G1 (Eta (i), Beta (i)) is strictly concave with respect to vector (Eta (i), Beta (i)); therefore the maximization of the transmission rate of the mobile relay is achieved in the premise of guaranteeing the requirements of the transmission rate of the local user.

Description

technical field [0001] The invention relates to a resource allocation method for a high-speed train and a local user to share an OFDMA system. Background technique [0002] OFDM has been widely used in current wireless communication systems because of its high spectrum efficiency and resistance to multipath delay. In order to support the access of multiple users, the LTE network adopts OFDMA based on OFDM as its multiple access technology. Traditional OFDMA network resource allocation methods often assume that all users are in a quasi-stationary state. However, with the rapid development of high-speed railways in recent years, there will be many highly mobile users in OFDMA networks. When the user is in a high-speed mobile state, the channel fading characteristics will be quite different from those in the low-speed mobile state, and OFDM will also have the problem of inter-carrier interference. It can be seen that high-speed mobile users and low-speed mobile users have diff...

Claims

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Application Information

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IPC IPC(8): H04L5/00H04W72/04
CPCH04L5/0037H04W72/04H04W72/0453H04W72/0473H04W72/52Y02D30/70
Inventor 张闯樊平毅
Owner TSINGHUA UNIV
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